#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int mainfsqh()
{
	int i, j;
	float a = 0, b = 0;
	for (i = 1; i < 100; i = i + 2)
	{
		a = a + (1.0 / i);
	}
	for (j = 2; j < 101; j = j + 2)
	{
		b = b - (1.0 / j);
	}
	printf("%f",a+b);
	return 0;
}